In the current material conditions we're in (everything is the same, we're still in hellworld, but the drug laws are the ideal for these conditions)?
In a social democratic state?
In a socialist state?
In FALGSC?
Would the policies actually change at all in any of these?
We don't really have a problem with maintaining a large enough supply of legal prescription drugs, so if we legalized all drugs in this way it should work mostly the same.
We often think of hard drugs as extremely expensive, but it's important to remember that is only the case because they are illegal. If Heroin were legal, it could probably be produced efficiently at scale for just a few cents per gram.
Then so long as the pure stuff is freely available no one is going to risk using stepped on mystery powders that are probably loaded with fentanyl.